This was mostly in the '90s, when King turned an eccentric, radio-born interview show into a venue for the biggest celebrities to hang loose and for political heavyweights to speak, almost unfiltered, to a nationwide audience.

It is where Ross Perot signaled his run for president, where O.J. Simpson's slow-speed car chase revealed the ratings gold behind his real-life soap opera, and where politicians like Bill Clinton turned when more conventional TV outlets proved too challenging.

When he was most popular, King balanced one of cable TV's most-watched shows with one of radio's most-listened-to programs, a column in USA Today, a syndicated TV show, various TV specials and a cameo appearance in any movie or television show that needed a deep-voiced guy sitting in front of a microphone.

"He was the first major star of cable . . . not just cable news," said Jonathan Klein, who until recently was King's boss, forced out in September as CNN's U.S. president. "He helped to get millions of Americans into the habit of going beyond Channel 11. At his height, the whole country was talking about Larry King."

As King completes his last broadcast of Larry King Live on Thursday, capping a quarter-century at CNN and five decades of broadcasting, critics may focus on the 77-year-old's recent ratings declines and a departure that seems as much CNN's idea as his own.

But when the most popular man in cable news is now Fox News Channel's partisan bully Bill O'Reilly, it's worth asking: Did King leave cable news, or did the audience, thirsty for partisan political combat and opinionating, leave him?

"There was a time when Larry King was perfect for television, when CNN was the only place you could go for cable news," said media analyst Andrew Tyndall. "Fox and MSNBC changed the definition of cable news in prime time from news to politics. And now, I don't think in modern-day cable news, the softer, nonpolitical format works anymore."

The producer's take

Pose the question about King's decline to his longtime senior executive producer Wendy Walker, who has shepherded Larry King Live for 17 of the show's 25 years, and she will cite almost any other cause — the explosion of alternate news sources on TV and online, the proliferation of ways for celebrities to speak to the world — rather than speculate on how rivals' partisan punditizing may have affected her boss' ratings.

Hosts like O'Reilly may pick public fights to spread their own fame, but the producer said she never felt comfortable making King the center of any story.

"I always got very nervous when the show became the news," said Walker, echoing admissions from her latest book, Producer: Lessons Shared from 30 Years in Television. "Because then we were part of the story, and then I always had to be so careful that we didn't effect the news."

In truth, King's style has always been a mashup of the best and worst of television interviewing. He's an engaging personality who listens to guests and gets some of the most famous names on the planet to relax in a comfortable space.

But he's also a relentless schmoozer whose legendary insistence on not preparing for interviews leaves him vulnerable. Back before sitting presidents would appear on shows like MythBusters or The View, critics groused that King gave politicians and big celebrities a TV platform to spin their problems, buoyed by softball questions.

"If he's such a softball interviewer, then why does his show make so much news?" countered Walker. "When I saw somebody say that about him, I realized they didn't know the show. It's the way he asks questions . . . you've got to get the person relaxed enough to have a conversation."

Genesis of a superstar

Larry King's eccentric, spectacular media odyssey began, as so many do, in Florida.

That's where Larry Zeiger, a kid from Brooklyn with less than $20 to his name, landed in 1957, snagging a job first at WAHR radio in Miami Beach and later WIOD, hosting a show from a houseboat parked across from the Fontainebleau hotel. The on-air name King was picked minutes before his radio debut.

Here King developed the style that would make him famous, snagging celebrities like Bobby Darin and Paul Newman with no chance to prepare. It's also where he built his first media empire, with jobs as a color commentator for the Miami Dolphins, writing a column for newspapers such as the Miami News and Miami Herald, and TV jobs at WTVJ and WPLG.

"One time, he was interviewing Newman, who was giving him stiff, straight answers," said Hank Goldberg, an analyst for ESPN who credits King with starting his on-air career by recommending him for jobs at WIOD. "He said to Newman, 'One of your early films was the worst ever, The Silver Chalice. How did you overcome that?' Newman sat up and said, 'You're right.' And like that, Larry broke the ice."

King also had problems; most famous was a 1971 arrest for grand larceny when a friend claimed he stole $5,000 after amassing more than $350,000 in debt. (The mug shot of a stunned-looking King still pops up all over the Internet.) In a flash, the radio program, TV shows and newspaper columns were gone. He eventually landed as an announcer at a horse racing track in Shreveport, La.

Then, a new general manager at WIOD noted listener surveys where fans kept asking about this guy named Larry King. So he rehired him.

In 1978, the Mutual Broadcasting Network asked King to host a syndicated radio show, eventually moving him to Washington, D.C. By the time CNN founder Ted Turner persuaded King to try a TV version, Goldberg knew that his old friend had a winning formula in hand.

"I give him credit; he lost it all and left, came back and overcame all of it," said the announcer. "Considering the level of talent in this town that has gone on (to major fame) — Steve Kroft, Katie Couric — Larry remains one of the real amazing success stories."

Last hurrah

Walker and CNN haven't confirmed who will guest on King's final show; rumors say his first-ever guest, former New York Gov. Mario Cuomo, may top a show broadcast from New York, Washington and the program's current home base, Los Angeles.

"I'm still kind of numb about it," said Walker, who can't imagine not fretting over a show that still airs, including reruns, every day on CNN. "It's been an eclectic and wonderful venue, and that's what we're going to celebrate."

Though King initially said leaving was his idea, he has since told New York magazine he quit after CNN offered just a one-year contract extension, which executives have never confirmed. He is still expected to appear in four CNN specials a year.

His ratings have sunk substantially — down from an average of 1.8 million people in November 2000 to 637,000 viewers last month, according to the Nielsen Co. — coinciding with CNN's drop to third in prime-time ratings. So it is small surprise that King and CNN would part ways now, making room for the brasher style of British chat show host, journalist and reality TV judge Piers Morgan.

Andrew Heyward, a former head of CBS News who now works as a consultant on digital media issues, suggested that King is leaving cable news as it becomes the ultimate expression of what he started.

"Larry paved the way for a more personality-driven cable news program," he said. "Now it's evolved beyond reassuring personalities to personalities with sharp opinions. You could argue that rather than cable leaving Larry King behind, maybe it's just caught up to him."

Times researcher Shirl Kennedy contributed to this report. Eric Deggans can be reached at deggans@sptimes.com or (727) 893-8521. See the Feed blog at tampabay.com/blogs/media.

Memorable moments

Larry King Live airs its final original episode at 9 p.m. Thursday on CNN. After 25 years interviewing leading celebrities, tabloid news stars and political leaders — famously with little preparation — Larry King's highs and lows can stretch as long as Lindsay Lohan's rap sheet. But here's a quick summary of the best and worst moments CNN's signature star has notched in a quarter-century of curiosity.

Hits . . .

Al Gore and Ross Perot debate NAFTA (1993): Vice President Al Gore and former independent presidential candidate Ross Perot drew the biggest ratings for a regularly scheduled program in cable history with their debate over the North American Free Trade Agreement. King later said President Bill Clinton told him it helped get the legislation passed.

Middle East leaders meet (1995): On his 10th anniversary, King got Israeli Prime Minister Yitzhak Rabin, Palestinian leader Yasser Arafat and Jordan's King Hussein on one broadcast to debate the future of the Middle East. The discussion made King look like TV's equivalent of a presidential ambassador.

Ross Perot announces presidential run . . . sorta (1992): After playing coy through several questions, the billionaire finally said he would run for president if supporters got his name on the ballot in 50 states. ("I want to see some sweat," he cracked.) They did, and Perot eventually earned 10 percent of the vote in 1992.

The surviving Beatles reunite (2007): To help promote the first anniversary of Cirque du Soleil's Las Vegas Beatles tribute, Love, King sat down in Sin City with Paul McCartney and Ringo Starr, joined by John Lennon's widow, Yoko Ono, and George Harrison's widow, Olivia. The result: baby boomer heaven.

And misses

Larry offends Jerry Seinfeld (2007): He turned it into a joke, but it was hard to tell whether Jerry Seinfeld was truly irritated when King asked whether NBC canceled his popular sitcom, which the comic ended by his own choice at the show's height in 1998.

Larry goes eating and driving with Snoop Dogg (2008, 2010): Hard to tell what's worse — watching a 70-something guy who has had a quintuple bypass sit down to a plate of fried chicken and waffles in 2008, or seeing the host chided by Snoop two years later for missing a turn while using his patented GPS unit. Like watching your grandma try to freestyle.

Marlon Brando kisses Larry (1994): At the end of a supremely odd interview where the overweight acting icon held forth barefoot, put on red suspenders and sang, Brando eventually kissed King goodbye on the lips. (Two years later, he'd tell King that Jews controlled Hollywood and allowed stereotypes about every other minority group.)

Larry makes up story about Sandy Koufax: In a 1991 Washington Post magazine profile, King is quoted as telling an audience in a Philadelphia synagogue one of his signature stories about the time he and the legendary pitcher drove to Connecticut from Brooklyn as teens to get ice cream. Koufax later told the reporter he and King weren't friends and didn't meet in Brooklyn, though they grew up in the same neighborhood. King couldn't explain why he told that story for 30 years.

Larry confuses Ringo Starr with his dead bandmate George Harrison (2007): King mistakenly called Starr George while asking a question in the Las Vegas interview; Paul McCartney seemed to take it worse, pointing out the gaffe several times. A year later, Starr would get irritated when King said his age, then 68, many times in a solo interview. (Fun fact: Ringo's only seven years younger than Larry!)